CN113603419A - Phase change energy storage mortar suitable for cold region engineering and preparation method thereof - Google Patents
Phase change energy storage mortar suitable for cold region engineering and preparation method thereof Download PDFInfo
- Publication number
- CN113603419A CN113603419A CN202110911144.2A CN202110911144A CN113603419A CN 113603419 A CN113603419 A CN 113603419A CN 202110911144 A CN202110911144 A CN 202110911144A CN 113603419 A CN113603419 A CN 113603419A
- Authority
- CN
- China
- Prior art keywords
- parts
- phase change
- energy storage
- stirring
- change energy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 50
- 238000004146 energy storage Methods 0.000 title claims abstract description 49
- 230000008859 change Effects 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000012407 engineering method Methods 0.000 title description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000012782 phase change material Substances 0.000 claims abstract description 38
- 239000002131 composite material Substances 0.000 claims abstract description 31
- 239000004568 cement Substances 0.000 claims abstract description 30
- 239000004576 sand Substances 0.000 claims abstract description 29
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims description 51
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 36
- 239000010439 graphite Substances 0.000 claims description 36
- 229910002804 graphite Inorganic materials 0.000 claims description 36
- BGHCVCJVXZWKCC-UHFFFAOYSA-N tetradecane Chemical compound CCCCCCCCCCCCCC BGHCVCJVXZWKCC-UHFFFAOYSA-N 0.000 claims description 32
- 238000002156 mixing Methods 0.000 claims description 21
- YCOZIPAWZNQLMR-UHFFFAOYSA-N heptane - octane Natural products CCCCCCCCCCCCCCC YCOZIPAWZNQLMR-UHFFFAOYSA-N 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 12
- 239000011398 Portland cement Substances 0.000 claims description 11
- 238000009775 high-speed stirring Methods 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 10
- 238000001179 sorption measurement Methods 0.000 claims description 8
- 239000011232 storage material Substances 0.000 claims description 8
- 238000001354 calcination Methods 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 5
- 238000003837 high-temperature calcination Methods 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 13
- 238000009413 insulation Methods 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 3
- 238000004321 preservation Methods 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 238000001035 drying Methods 0.000 description 6
- 239000004567 concrete Substances 0.000 description 5
- 230000008014 freezing Effects 0.000 description 5
- 238000007710 freezing Methods 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000012188 paraffin wax Substances 0.000 description 3
- 239000004566 building material Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
- C04B2103/0071—Phase-change materials, e.g. latent heat storage materials used in concrete compositions
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses phase change energy storage mortar suitable for cold region engineering and a preparation method thereof, wherein the mortar is composed of the following materials: 540 parts of cement, 1278 parts of sand, 10.8-32.4 parts of composite phase change material, 270 parts of water and 2.7 parts of water reducing agent by weight; the phase change energy storage mortar prepared by the invention has good mechanical property, heat conductivity, heat preservation and insulation property and freeze-thaw resistance, overcomes the leakage problem of the phase change material in the cement-based material, and provides a new method for improving the freeze-thaw resistance of the mortar. And the prepared phase change energy storage mortar does not need additional equipment and artificial energy supply, only utilizes the existing energy in the nature, and meets the target requirement of sustainable development.
Description
Technical Field
The invention belongs to the technical field of manufacturing of building materials in high and cold regions, and particularly relates to phase change energy storage mortar suitable for cold region engineering and a preparation method thereof.
Background
Because the land and the living things in China are in the world, the areas of seasonal frozen soil and perennial frozen soil respectively account for 53.5 percent and 21.5 percent of the area of the land and the land in China, the climate of the appearing region is variable, and the difference of the service life of the engineering structure is large. Especially in the northwest and northeast cold areas of China, the temperature is lower and the duration is longer,
for example, the temperature in Xinjiang is about-10 to-40 ℃ in winter, and the annual negative temperature duration is about 130 days; the average freezing days (the air temperature is lower than 0 ℃) of northeast China (Changchun) are about 150 days, and the freezing-thawing cycle times of the cement-based materials are as many as 120 days. The temperature difference between day and night in the areas is large, the freezing depth of the building is thick, and the severe freezing injury problem generally exists in cold area engineering.
In recent years, the use of low temperature phase change materials has been proposed to improve the freeze resistance of cementitious materials. The principle is that when the ambient temperature is lower than the melting point of the phase change material, the phase change material prevents the sudden drop of the temperature of the substrate by solidifying to release the heat stored in its mass. However, the method has defects and is difficult to apply to cold region engineering. One is that the phase transition starting temperature should be higher than 0 ℃, because the temperature of the cement-based material is lower than 0 ℃, water in pores can be frozen, and the volume of the water is expanded by about 9% when the water is frozen into ice, so that expansion pressure is generated in the cement-based material, and when the expansion pressure exceeds the tensile strength of the water, pores can be generated in an interface transition area to cause concrete cracking. And secondly, the phase change material has a low hot break value and cannot provide enough relief time for sudden drop of engineering temperature in cold regions. And thirdly, the strength is insufficient, and the leakage problem can inhibit the hydration reaction of the cement due to the fact that the phase-change material is mixed into the mortar, so that the risk of insufficient strength exists in the early use of building engineering. Therefore, the popularization and application of the phase change energy storage mortar in cold region engineering are limited due to the defects, and the development of novel phase change energy storage mortar with high strength, good heat insulation performance, strong freezing resistance and the like is needed.
Disclosure of Invention
The invention aims to provide phase change energy storage mortar suitable for cold region engineering and a preparation method thereof, which solve the problems in the background art.
The purpose of the invention is realized by adopting the following technical scheme:
the phase change energy storage mortar suitable for cold region engineering comprises the following raw materials in parts by weight: 540 parts of cement, 1278 parts of sand, 10.8-32.4 parts of composite phase change material, 270 parts of water and 2.7 parts of water reducing agent.
Further, the phase change energy storage mortar suitable for cold region engineering comprises the following raw materials in parts by weight: 540 parts of cement, 1278 parts of sand, 21.6 parts of composite phase change energy storage material, 270 parts of water and 2.7 parts of water reducing agent.
Further, the composite phase change material consists of n-tetradecane and expanded graphite, wherein the mass ratio of the n-tetradecane to the expanded graphite is 13: 1.
Further, the preparation method of the expanded graphite comprises the following steps: by usingPreparing expanded graphite by a microwave oven method, calcining the dried expandable graphite in a microwave oven at 700W for 40s to obtain the expanded graphite with the expansion multiplying power of 250 times, wherein the bulk density of the obtained expanded graphite is 4 kg/m3。
Further, the preparation method of the composite phase change energy storage material comprises the following steps: weighing the dried expanded graphite and the n-tetradecane according to a certain proportion, putting the weighed expanded graphite and the n-tetradecane into a container, stirring for 2 hours, closing the stirring, and putting the obtained composite phase change material into a 60 ℃ forced air drying oven for 4 hours for later use.
Further, the expanded graphite is expandable graphite which is expandable by a factor of 250.
Further, the cement is 42.5-grade ordinary portland cement.
Further, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
Further, the phase change material is n-tetradecane.
The invention also discloses a preparation method of the phase change energy storage mortar suitable for cold region engineering, which comprises the following steps: weighing the raw materials, mixing the portland cement and the sand, carrying out first low-speed stirring to obtain a mixture A, mixing a water reducing agent and water, adding the mixture A, and carrying out second low-speed stirring and mixing; and then adding the composite phase-change material, continuously stirring at a low speed for 2-3 min, and stirring at a high speed to obtain the composite phase-change material.
Further, the low-speed stirring speed is 30-40 r/min; the high-speed stirring speed is 60-120 r/min.
Further, the time of the first low-speed stirring is 2-3 min; the time for the second stirring is 3-4 min; the high-speed stirring time for the third time is 2-3 min.
Has the advantages that: compared with mortar used in traditional cold region engineering, the invention has the following advantages:
1. the composite phase change energy storage material prepared by the invention has good packaging and excellent thermal property.
2. The phase change energy storage mortar prepared by the invention has high strength, good thermal insulation performance and excellent freezing resistance.
3. The phase change energy storage mortar adopted by the invention realizes automatic adjustment of the internal temperature of cold region engineering, does not need additional equipment and artificial energy supply, is energy-saving and environment-friendly, and meets the target requirement of sustainable development.
Drawings
FIG. 1 is an electron microscope scan of the expanded graphite and composite phase change material prepared in example 1 of the present invention;
fig. 2 is a graph of compressive strength versus number of freeze-thaw cycles.
Detailed Description
Example 1
A phase change energy storage mortar for cold region engineering is composed of the following materials: cement: 540 parts of sand 1278 parts, and a composite phase change material: 10.8 parts of water: 270 parts of water reducing agent: 2.7 parts by weight.
The cement is 42.5-grade ordinary portland cement provided by Kernel concrete of Keemun mountain cement of Lanzhou, the specific surface area measured by a nitrogen adsorption method is 352m2/Kg, and the compressive strength in 28 days is 49.2 MPa.
The sand is selected from continuous graded dried river sand of Satsugao Gansu, and the fineness modulus is 2.98.
The composite phase-change material is selected from paraffin/expanded graphite phase-change materials, and the preparation method comprises the following steps:
the method comprises the following steps: putting the graphite in a blast drying oven with the temperature set to 105 ℃ for drying for 24h to constant weight;
step two: high-temperature calcination: placing the graphite into a microwave oven, and calcining for 40 seconds at 700 ℃ to obtain expanded graphite;
step three: adsorption: putting the expanded graphite obtained in the step one into a container, adding n-tetradecane, and manually stirring and standing for 2 hours; at this point the expanded graphite has absorbed n-tetradecane well.
The mass fraction of n-tetradecane in the mixture of expanded graphite and n-tetradecane was 93%.
A phase change energy storage mortar for cold region engineering is prepared by the following steps:
the method comprises the following steps: proportioning: taking 540 parts of cement by weight, and obtaining 10.8 parts of the composite phase change material, 1278 parts of river sand, 270 parts of water and 2.7 parts of a water reducing agent;
step two: mixing and stirring: mixing portland cement and sand, carrying out first low-speed stirring to obtain a mixture A, mixing a water reducing agent and water, adding the mixture A, and carrying out second low-speed stirring and mixing; and then adding the composite phase-change material, continuously stirring for 2min at a low speed, and stirring at a high speed to obtain the phase-change energy-storage mortar.
The low-speed stirring speed is 30 r/min; the high-speed stirring speed is 60 r/min; the time of the first low-speed stirring is 2 min; the time of the second low-speed stirring is 3 min; the high speed stirring time is 2 min.
Step three: vibrating: pouring the phase change energy storage mortar obtained in the step two into a mould, placing the mould on a vibration table, vibrating for 60s, and removing the mould after 1d to obtain a test piece;
step four: standard maintenance: and (5) placing the test piece obtained in the step three into a standard curing room for curing for 28 days to obtain the phase change energy storage material.
Example 2
A phase change energy storage mortar for cold region engineering is composed of the following materials: cement: 540 parts of sand: 1278 parts of composite phase-change material: 21.6 parts of water: 270 parts of water reducing agent: 2.7 parts by weight.
The cement is 42.5-grade ordinary portland cement provided by Kernel concrete of Keemun mountain cement of Lanzhou, the specific surface area measured by a nitrogen adsorption method is 352m2/Kg, and the compressive strength in 28 days is 49.2 MPa.
The sand is selected from continuous graded dried river sand of Satsugao Gansu, and the fineness modulus is 2.98.
The composite phase-change material is selected from paraffin/expanded graphite phase-change materials, and the preparation method comprises the following steps:
the method comprises the following steps: putting the graphite in a blast drying oven with the temperature set to 105 ℃ for drying for 24h to constant weight;
step two: high-temperature calcination: placing the graphite into a microwave oven, and calcining for 40 seconds at 700 ℃ to obtain expanded graphite;
step three: adsorption: putting the expanded graphite obtained in the step one into a container, adding n-tetradecane, and manually stirring and standing for 2 hours; at this point the expanded graphite has absorbed n-tetradecane well.
A preparation method of phase change energy storage mortar for cold region engineering comprises the following steps:
the method comprises the following steps: proportioning: taking materials according to parts by weight, wherein the cement accounts for 540 parts, the obtained composite phase change material accounts for 21.6 parts, the river sand accounts for 1278 parts, the water accounts for 270 parts, and the water reducing agent accounts for: 2.7 parts;
step two: mixing and stirring: mixing portland cement and sand, carrying out first low-speed stirring to obtain a mixture A, mixing a water reducing agent and water, adding the mixture A, and carrying out second low-speed stirring and mixing; and then adding the composite phase-change material, continuously stirring for 3min at a low speed, and stirring at a high speed to obtain the phase-change energy-storage mortar.
The low-speed stirring speed is 40 r/min; the high-speed stirring speed is 120 r/min; the time of the first low-speed stirring is 3 min; the time of the second low-speed stirring is 4 min; the high speed stirring time is 3 min.
Step three: vibrating: pouring the phase change energy storage mortar obtained in the step two into a mould, placing the mould on a vibration table, vibrating for 60s, and removing the mould after 1d to obtain a test piece;
step four: standard maintenance: and (5) placing the test piece obtained in the step three into a standard curing room for curing for 28 days to obtain the phase change energy storage material.
Example 3
A phase change energy storage mortar for cold region engineering is composed of the following materials: cement: 540 parts of sand 1278 parts, and a composite phase change material: 32.4 parts of water: 270 parts of water reducing agent: 2.7 parts by weight.
The cement is 42.5-grade ordinary portland cement provided by Kernel concrete of Keemun mountain cement of Lanzhou, the specific surface area measured by a nitrogen adsorption method is 352m2/Kg, and the compressive strength in 28 days is 49.2 MPa.
The sand is selected from continuous graded dried river sand of Satsugao Gansu, and the fineness modulus is 2.98.
The composite phase-change material is selected from paraffin/expanded graphite phase-change materials, and the preparation method comprises the following steps:
the method comprises the following steps: putting the graphite in a blast drying oven with the temperature set to 105 ℃ for drying for 24h to constant weight;
step two: high-temperature calcination: placing the graphite into a microwave oven, and calcining for 40 seconds at 700 ℃ to obtain expanded graphite;
step three: adsorption: putting the expanded graphite obtained in the step one into a container, adding n-tetradecane, and manually stirring and standing for 2 hours; at this point the expanded graphite has absorbed n-tetradecane well.
A phase change energy storage mortar for cold region engineering is prepared by the following steps:
the method comprises the following steps: proportioning: taking materials according to parts by weight, wherein the cement accounts for 540 parts, the obtained composite phase change material accounts for 32.4 parts, the river sand accounts for 1278 parts, the water accounts for 270 parts, and the water reducing agent accounts for: 2.7 parts;
step two: mixing and stirring: mixing portland cement and sand, carrying out first low-speed stirring to obtain a mixture A, mixing a water reducing agent and water, adding the mixture A, and carrying out second low-speed stirring and mixing; and then adding the composite phase-change material, continuously stirring for 2min at a low speed, and stirring at a high speed to obtain the phase-change energy-storage mortar.
The low-speed stirring speed is 35 r/min; the high-speed stirring speed is 90 r/min; the time of the first low-speed stirring is 3 min; the time of the second low-speed stirring is 4 min; the high speed stirring time is 2 min.
Step three: vibrating: pouring the phase change energy storage mortar obtained in the step two into a mould, placing the mould on a vibration table, vibrating for 60s, and removing the mould after 1d to obtain a test piece;
step four: standard maintenance: and (5) placing the test piece obtained in the step three into a standard curing room for curing for 28 days to obtain the phase change energy storage material.
Comparative example 1
A phase change energy storage mortar for cold region engineering is composed of the following materials: cement: 540 parts of sand: 1278 parts of composite phase-change material: 0 part of water: 270 parts of water reducing agent: 2.7 parts by weight.
The cement is 42.5-grade ordinary portland cement provided by Kernel concrete of Keemun mountain cement of Lanzhou, the specific surface area measured by a nitrogen adsorption method is 352m2/Kg, and the compressive strength in 28 days is 49.2 MPa.
The sand is selected from continuous graded dried river sand of Satsugao Gansu, and the fineness modulus is 2.98.
The preparation method of the mortar comprises the following steps:
the method comprises the following steps: proportioning: taking materials according to parts by weight, wherein the cement is 540 parts, the river sand is 1278 parts, the water is 270 parts, and the water reducing agent is as follows: 2.7 parts;
step two: mixing and stirring: and sequentially adding water, cement, river sand and a water reducing agent into the stirring pot, and uniformly stirring to obtain the common mortar.
Step three: vibrating: pouring the mortar obtained in the step two into a mould, placing the mould on a vibration table, vibrating for 60s, and removing the mould after 1d to obtain a test piece;
step four: standard maintenance: and (5) placing the test piece obtained in the step three into a standard curing room for curing for 28 days to obtain the common building material.
The performance of the phase change energy storage mortar for cold region engineering prepared in the embodiments 1 to 3 is compared with that of the common mortar without the phase change energy storage material, and the results are as follows:
the comparative example 1 is the reference mortar without the composite phase change material, and the data in the table show that the phase change energy storage mortar for cold region engineering still has higher strength and is still suitable for a load-bearing structure under the condition of the same water-cement ratio. The reduction of the heat conductivity coefficient shows that the phase change energy storage mortar has excellent heat preservation and heat insulation performance. In fig. 2, lines 0, 2, 4 and 6 correspond to comparative example 1, example 2 and example 3, respectively, and it can be seen from fig. 2 that, as the number of freeze-thaw cycles increases, the compressive strength values of examples 2 and 3 are relatively close to those of comparative example 1 when the number of freeze-thaw cycles reaches 50, and then, the compressive strength of examples 2 and 3 decreases slowly and the compressive strength of comparative example 1 decreases sharply, and when 200 times pass, examples 2 and 3 exceed comparative example 1 much; example 1 the compressive strength after 100 cycles of freeze-thaw cycles exceeded that of comparative example 1, and all three examples had compressive strengths far exceeding that of comparative example 1 by 200 cycles.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The phase change energy storage mortar suitable for cold region engineering is characterized by being prepared from the following raw materials in parts by weight: cement: 540 parts of sand: 1278 parts of composite phase-change material: 10.8-32.4 parts of water: 270 parts of water reducing agent: 2.7 parts.
2. The phase change energy storage mortar suitable for cold region engineering according to claim 1, which is prepared from the following raw materials in parts by weight: ordinary portland cement: 540 parts of sand: 1278 parts of composite phase-change material: 21.6 parts of water: 270 parts of water reducing agent: 2.7 parts.
3. The phase change energy storage mortar suitable for cold region engineering according to claim 1, wherein the composite phase change material is composed of n-tetradecane and expanded graphite, and the mass ratio of the n-tetradecane to the expanded graphite is 13: 1.
4. The phase change energy storage mortar suitable for cold region engineering according to claim 1, wherein the water reducer is a polycarboxylic acid water reducer.
5. A preparation method of phase change energy storage mortar suitable for cold region engineering is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: high-temperature calcination: placing the graphite into a microwave oven, and calcining for 40 seconds at 700 ℃ to obtain expanded graphite;
step two: adsorption: putting the expanded graphite obtained in the step one into a container, adding n-tetradecane, and manually stirring and standing for 2 hours;
step three: proportioning: taking 540 parts of cement, 10.8-32.4 parts of the composite phase change material obtained in the step two, 1278 parts of river sand, 270 parts of water and 2.7 parts of a water reducing agent according to parts by weight;
step four: mixing and stirring: adding water, cement, river sand, a water reducing agent and a composite phase-change material into a stirring pot, and uniformly stirring to obtain phase-change energy-storage mortar;
step five: vibrating: pouring the phase change energy storage mortar obtained in the fourth step into a mould, placing the mould on a vibration table, vibrating for 60s, and removing the mould after 1d to obtain a test piece;
step six: standard maintenance: and D, placing the test piece obtained in the fifth step into a standard curing room for curing for 28 days to obtain the phase change energy storage material.
6. The preparation method of the phase change energy storage mortar suitable for cold region engineering according to claim 5, characterized by comprising the following steps: in the fourth step, the mixing and stirring specifically comprises the following steps: mixing the portland cement and sand, and stirring at a low speed for the first time to obtain a mixture A; mixing a water reducing agent with water, adding the mixture into the mixture A, and stirring and mixing at a low speed for the second time; and then adding the composite phase-change material, continuously stirring at a low speed for 2-3 min, and stirring at a high speed to obtain the composite phase-change material.
7. The preparation method of the phase change energy storage mortar suitable for cold region engineering according to claim 6, characterized by comprising the following steps: the low-speed stirring speed is 30-40 r/min; the high-speed stirring speed is 60-120 r/min.
8. The preparation method of the phase change energy storage mortar suitable for cold region engineering according to claim 6, characterized by comprising the following steps: the time of the first low-speed stirring is 2-3 min; the time of the second low-speed stirring is 3-4 min; the high-speed stirring time is 2-3 min.
9. The preparation method of the phase change energy storage mortar suitable for cold region engineering according to claim 5, characterized by comprising the following steps: in the fifth step, the sizes of the moulds are respectively as follows: length × width × height ═ 40mm × 40mm × 160 mm; length × width × height is 70.7mm × 70.7mm × 70.7 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110911144.2A CN113603419A (en) | 2021-08-06 | 2021-08-06 | Phase change energy storage mortar suitable for cold region engineering and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110911144.2A CN113603419A (en) | 2021-08-06 | 2021-08-06 | Phase change energy storage mortar suitable for cold region engineering and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113603419A true CN113603419A (en) | 2021-11-05 |
Family
ID=78307867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110911144.2A Pending CN113603419A (en) | 2021-08-06 | 2021-08-06 | Phase change energy storage mortar suitable for cold region engineering and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113603419A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114230229A (en) * | 2021-12-30 | 2022-03-25 | 河北农业大学 | Calcium chloride hexahydrate composite phase change thermal insulation mortar |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012075747A1 (en) * | 2010-12-10 | 2012-06-14 | 东南大学 | Paraffin phase change energy storage materials and preparation method thereof |
| CN111592303A (en) * | 2020-05-21 | 2020-08-28 | 重庆交通大学 | Preparation method of tetradecane expanded graphite low-temperature phase-change cement mortar |
-
2021
- 2021-08-06 CN CN202110911144.2A patent/CN113603419A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012075747A1 (en) * | 2010-12-10 | 2012-06-14 | 东南大学 | Paraffin phase change energy storage materials and preparation method thereof |
| CN111592303A (en) * | 2020-05-21 | 2020-08-28 | 重庆交通大学 | Preparation method of tetradecane expanded graphite low-temperature phase-change cement mortar |
Non-Patent Citations (1)
| Title |
|---|
| 朱洪洲: "相变水泥混凝土的力学性能与低温调温性能", 《硅酸盐通报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114230229A (en) * | 2021-12-30 | 2022-03-25 | 河北农业大学 | Calcium chloride hexahydrate composite phase change thermal insulation mortar |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113185237A (en) | Nano-enhanced phase-change antifreezing concrete mixture and preparation method thereof | |
| CN114751691B (en) | Phase-change large-volume concrete and preparation method thereof | |
| CN112608053A (en) | Modified aggregate, preparation method and concrete using modified aggregate | |
| CN113603419A (en) | Phase change energy storage mortar suitable for cold region engineering and preparation method thereof | |
| CN106630901A (en) | Green high-performance concrete | |
| CN113831088B (en) | Phase-change large-volume concrete and preparation method thereof | |
| CN113526940A (en) | Anti-freezing inorganic quick-setting grouting material and preparation method thereof | |
| CN111018436A (en) | High-strength anti-permeability anti-freezing concrete and processing technology thereof | |
| CN112919869B (en) | Low-density grouting material and preparation method thereof | |
| CN111875311B (en) | Anti-freezing concrete and preparation process thereof | |
| CN107663036B (en) | Preparation method of anti-freezing concrete shrinkage reducing agent | |
| CN112979241A (en) | Anti-freezing concrete and preparation method thereof | |
| CN114044660B (en) | Desert aeolian sand modified concrete and preparation process thereof | |
| CN102924006B (en) | Inorganic phase change energy-saving and heat insulating ultra-light aggregate as well as preparation method thereof and application thereof | |
| CN111499295B (en) | Steam-cured cement-based material with high water absorption resistance and preparation method thereof | |
| CN117585967A (en) | Sensible heat storage bearing wall material and preparation method and application thereof | |
| CN117903758B (en) | Freeze-proof paraffin-pumice phase-change composite material and preparation method and application thereof | |
| CN112321213A (en) | Heat insulation concrete and preparation method thereof | |
| CN110723946A (en) | Anti-freezing foam concrete suitable for cold region engineering and preparation method thereof | |
| CN116253545B (en) | Low-shrinkage ultra-freezing-resistant coarse aggregate ultra-high-performance concrete pavement layer and preparation method thereof | |
| CN117809768B (en) | Method for evaluating compressive strength of fly ash foam concrete based on density | |
| CN111484352B (en) | Light heat-insulating brick and preparation method thereof | |
| CN107619241B (en) | Light-transmitting energy-storage concrete applied to passive solar house and preparation method thereof | |
| CN117550851A (en) | Heat-insulating anti-freezing mortar composition and preparation process thereof | |
| CN116903321A (en) | Lightweight concrete phase-change energy-storage heat-preservation building block and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211105 |
|
| RJ01 | Rejection of invention patent application after publication |